I hold this presentation during the Drupal User Group Meetup in Basel on 25th April 2012. It's an overview of Drupalmonitor.com. I covered topics about general wishes regarding Drupal monitoring. I also talked about existing solutions.
I also made a demo (not included in the presentation). If you want to try the service yourself, you can create an account on www.drupalmonitor.com and start monitoring your sites!